Application and Performance Analysis of Lithium Iron Phosphate Battery in Photoelectric Complementary System

In order to make the device better capable of power supply, it is necessary to select a corresponding battery, and the lithium iron phosphate battery is favored for its excellent performance. In this study, the requirements of the lithium iron phosphate battery for optoelectronic complementary power supply system were analyzed at first, then the application of the battery in the supply system was further analyzed. Next, the structure and working principle of the battery were deeply studied, and a large number of experiments were designed to analyze the performance of the battery. It has been confirmed by a large number of experiments that the charging process of lithium iron phosphate battery is slow; the remaining capacity of lithium iron phosphate battery has a correlation with the voltage it carries. During the charging process, the internal resistance of the lithium iron phosphate battery will rapidly drop to a stable value, and the conversion of constant current charging to constant voltage charging will further reduce the internal resistance. Adjusting the battery temperature can adjust the internal capacity of the battery, that is, increasing the temperature can promote the expansion of the battery capacity to a certain extent, and lowering the temperature can impair the overall performance of the battery. In the battery AC (alternating current) impedance spectrum test, the impedance of the battery was affected by factors such as inductance, lithium ion diffusion, and internal polarization of the battery. Through the above research, the power consumption of lithium iron phosphate battery can be better understood to make better use of solar energy and provide people with stable green energy.

Download Full-text

State-of-Charge Monitoring and Battery Diagnosis of Different Lithium Ion Chemistries Using Impedance Spectroscopy

Batteries ◽

10.3390/batteries7010017 ◽

2021 ◽

Vol 7 (1) ◽

pp. 17

Author(s):

Peter Kurzweil ◽

Wolfgang Scheuerpflug

Keyword(s):

Impedance Spectroscopy ◽

Lithium Iron Phosphate ◽

Linear Trend ◽

Lithium Ion ◽

Iron Phosphate ◽

Discharge Voltage ◽

State Of Charge ◽

Constant Current ◽

Impedance Method ◽

Battery Capacity

For lithium iron phosphate batteries (LFP) in aerospace applications, impedance spectroscopy is applicable in the flat region of the voltage-charge curve. The frequency-dependent pseudocapacitance at 0.15 Hz is presented as useful state-of-charge (SOC) and state-of-health (SOH) indicator. For the same battery type, the prediction error of pseudocapacitance is better than 1% for a quadratic calibration curve, and less than 36% for a linear model. An approximately linear correlation between pseudocapacitance and Ah battery capacity is observed as long as overcharge and deep discharge are avoided. We verify the impedance method in comparison to the classical constant-current discharge measurements. In the case of five examined lithium-ion chemistries, the linear trend of impedance and SOC is lost if the slope of the discharge voltage curve versus SOC changes. With nickel manganese cobalt (NMC), high impedance modulus correlates with high SOC above 70%.

Download Full-text

Material Characterization and Analysis on the Effect of Vibration and Nail Penetration on Lithium Ion Battery

World Electric Vehicle Journal ◽

10.3390/wevj10040069 ◽

2019 ◽

Vol 10 (4) ◽

pp. 69

Author(s):

Ajeet Babu K. Parasumanna ◽

Ujjwala S. Karle ◽

Mangesh R. Saraf

Keyword(s):

Surface Morphology ◽

Lithium Iron Phosphate ◽

Electrochemical Impedance ◽

Dynamic Stiffness ◽

Lithium Ion ◽

Iron Phosphate ◽

Internal Resistance ◽

Chemical Degradation ◽

Battery Pack ◽

A Cell

Battery packaging in a vehicle depends on the cell chemistry being used and its behavior plays an important role in the safety of the entire battery pack. Chemical degradation of various parts of a cell such as the cathode or anode is a concern as it adversely affects performance and safety. A cell in its battery pack once assembled can have two different mechanical abuse condition. One is the vibration generated from the vehicle and the second is the intrusion of external elements in case of accident. In this paper, a commercially available 32,700 lithium ion cell with lithium iron phosphate (LFP) chemistry is studied for its response to both the abuse conditions at two different states of charge (SoC). The primary aim of this study is to understand their effect on the surface morphology of the cathode and the anode. The cells are also characterized to study impedance behavior before and after being abused mechanically. The cells tested for vibration were also analyzed for dynamic stiffness. A microscopy technique such as scanning electron microscopy (SEM) was used to study the surface morphology and electrochemical impedance spectroscopy (EIS) characterization was carried out to study the internal resistance of the cell. It was observed that there was a drop in internal resistance and increase in the stiffness after the cells subjected to mechanical abuse. The study also revealed different morphology at the center and at the corner of the cell subjected to nail penetration at 50% SoC.

Download Full-text

Float-Charging Characteristics of Lithium Iron Phosphate Battery Based on Direct-Current Power Supply System in Substation

Journal of Energy Engineering ◽

10.1061/(asce)ey.1943-7897.0000273 ◽

2016 ◽

Vol 142 (1) ◽

pp. 04015016

Author(s):

Zengfu Wei ◽

Guobin Zhong ◽

Wei Su ◽

Wenhong Wang ◽

Yanquan Zhang ◽

...

Keyword(s):

Direct Current ◽

Power Supply ◽

Power Supply System ◽

Lithium Iron Phosphate ◽

Iron Phosphate ◽

Supply System

Download Full-text

Simulation of an autonomous power supply system based on lithium-iron-phosphate (LiFePO4)

MATEC Web of Conferences ◽

10.1051/matecconf/201714101060 ◽

2017 ◽

Vol 141 ◽

pp. 01060 ◽

Cited By ~ 1

Author(s):

Mikhail Popov ◽

Oleg Maniv

Keyword(s):

Power Supply ◽

Power Supply System ◽

Lithium Iron Phosphate ◽

Iron Phosphate ◽

Supply System

Download Full-text

The Degradation Behavior of LiFePO4/C Batteries during Long-Term Calendar Aging

Energies ◽

10.3390/en14061732 ◽

2021 ◽

Vol 14 (6) ◽

pp. 1732

Author(s):

Xin Sui ◽

Maciej Świerczyński ◽

Remus Teodorescu ◽

Daniel-Ioan Stroe

Keyword(s):

Lithium Iron Phosphate ◽

Lithium Ion ◽

Iron Phosphate ◽

Storage Condition ◽

Internal Resistance ◽

Stress Factors ◽

Regression Approach ◽

Degradation Behaviors ◽

Aging Models

With widespread applications for lithium-ion batteries in energy storage systems, the performance degradation of the battery attracts more and more attention. Understanding the battery’s long-term aging characteristics is essential for the extension of the service lifetime of the battery and the safe operation of the system. In this paper, lithium iron phosphate (LiFePO4) batteries were subjected to long-term (i.e., 27–43 months) calendar aging under consideration of three stress factors (i.e., time, temperature and state-of-charge (SOC) level) impact. By means of capacity measurements and resistance calculation, the battery’s long-term degradation behaviors were tracked over time. Battery aging models were established by a simple but accurate two-step nonlinear regression approach. Based on the established model, the effect of the aging temperature and SOC level on the long-term capacity fade and internal resistance increase of the battery is analyzed. Furthermore, the storage life of the battery with respect to different stress factors is predicted. The analysis results can hopefully provide suggestions for optimizing the storage condition, thereby prolonging the lifetime of batteries.

Download Full-text

Effect of Conductive Material Morphology on Spherical Lithium Iron Phosphate

Nanomaterials ◽

10.3390/nano8110904 ◽

2018 ◽

Vol 8 (11) ◽

pp. 904 ◽

Cited By ~ 3

Author(s):

Lizhi Wen ◽

Jiachen Sun ◽

Liwei An ◽

Xiaoyan Wang ◽

Xin Ren ◽

...

Keyword(s):

Carbon Nanotube ◽

Low Temperature ◽

Electrochemical Performance ◽

Lithium Iron Phosphate ◽

Carbon Sources ◽

Lithium Ion ◽

Iron Phosphate ◽

Internal Resistance ◽

Conductive Agent ◽

The Stability

As an integral part of a lithium-ion battery, carbonaceous conductive agents have an important impact on the performance of the battery. Carbon sources (e.g., granular Super-P and KS-15, linear carbon nanotube, layered graphene) with different morphologies were added into the battery as conductive agents, and the effects of their morphologies on the electrochemical performance and processability of spherical lithium iron phosphate were investigated. The results show that the linear carbon nanotube and layered graphene enable conductive agents to efficiently connect to the cathode materials, which contribute to improving the stability of the electrode-slurry and reducing the internal resistance of cells. The batteries using nanotubes and graphene as conductive agents showed weaker battery internal resistance, excellent electrochemical performance and low-temperature dischargeability. The battery using carbon nanotube as the conductive agent had the best overall performance with an internal resistance of 30 mΩ. The battery using a carbon nanotube as the conductive agent exhibited better low-temperature performance, whose discharge capacity at −20 °C can reach 343 mAh, corresponding to 65.0% of that at 25 °C.

Download Full-text

Graphenised Lithium Iron Phosphate and Lithium Manganese Silicate Hybrid Cathodes: Potentials for Application in Lithium‐ion Batteries

Electroanalysis ◽

10.1002/elan.202060435 ◽

2020 ◽

Vol 32 (12) ◽

pp. 2982-2999

Author(s):

Zolani Myalo ◽

Chinwe Oluchi Ikpo ◽

Assumpta Chinwe Nwanya ◽

Miranda Mengwi Ndipingwi ◽

Samantha Fiona Duoman ◽

...

Keyword(s):

Lithium Ion Batteries ◽

Lithium Iron Phosphate ◽

Lithium Ion ◽

Iron Phosphate ◽

Manganese Silicate ◽

Lithium Manganese

Download Full-text

A Novel Pyrometallurgical Recycling Process for Lithium-Ion Batteries and Its Application to the Recycling of LCO and LFP

Metals ◽

10.3390/met11010149 ◽

2021 ◽

Vol 11 (1) ◽

pp. 149

Author(s):

Alexandra Holzer ◽

Stefan Windisch-Kern ◽

Christoph Ponak ◽

Harald Raupenstrauch

Keyword(s):

Lithium Ion Batteries ◽

Lithium Iron Phosphate ◽

Process Development ◽

Removal Rate ◽

Continuous Process ◽

Lithium Ion ◽

Iron Phosphate ◽

Recycling Process ◽

Subsequent Step ◽

Pre Treatment

The bottleneck of recycling chains for spent lithium-ion batteries (LIBs) is the recovery of valuable metals from the black matter that remains after dismantling and deactivation in pre‑treatment processes, which has to be treated in a subsequent step with pyrometallurgical and/or hydrometallurgical methods. In the course of this paper, investigations in a heating microscope were conducted to determine the high-temperature behavior of the cathode materials lithium cobalt oxide (LCO—chem., LiCoO2) and lithium iron phosphate (LFP—chem., LiFePO4) from LIB with carbon addition. For the purpose of continuous process development of a novel pyrometallurgical recycling process and adaptation of this to the requirements of the LIB material, two different reactor designs were examined. When treating LCO in an Al2O3 crucible, lithium could be removed at a rate of 76% via the gas stream, which is directly and purely available for further processing. In contrast, a removal rate of lithium of up to 97% was achieved in an MgO crucible. In addition, the basic capability of the concept for the treatment of LFP was investigated whereby a phosphorus removal rate of 64% with a simultaneous lithium removal rate of 68% was observed.

Download Full-text